Why does my cat suddenly start hissing?

Often something has scared or stressed it: a noise, a cat outside, a visitor or a change at home. But sudden hissing, or hissing when you touch one spot, can mean pain. Have the vet check it if it lasts, or if your cat also hides or eats less.

Does my cat hate me when it hisses at me?

No. A hiss says the moment is too much: your cat is scared, hurting or has had enough. It says nothing about whether it likes you. Give it room and it will often come back by itself.

Why does my cat hiss or growl when I pet it?

It has reached its limit, or the touch hurts or is in a place it dislikes. Watch for a flicking tail and ears turning back, stop at the first sign and keep petting short. If it hisses at one spot every time, ask the vet to check for pain. If it also bites while you pet it, read more there.

What is the difference between a hiss and a growl?

A hiss is a breathy sound with no voice, made through an open mouth, and mostly comes from fear. A growl is a low, rough sound made with the voice, a firmer warning that comes when the hiss did not work. Take both seriously and give space.

Why does my cat hiss when playing?

Real play is quiet, so a hiss means the game got too rough or too exciting, or one cat misread the other. End the game before that point, and use a wand toy instead of your hands.

Why does my cat huff at me?

A short huff or puff has not been studied well. Blowing and snorting sounds are mentioned with a defensive posture, and a blowing hiss belongs to a scared cat that does not want to be approached. So treat it like a quiet hiss: step back and look at the rest of your cat.

What can I do if my cats cannot get along any more and keep hissing?

Separate them calmly, give each its own litter box, food and resting places, and have both checked by the vet. Then introduce them again step by step, as if they were strangers: scents first, then sight through a barrier, then short meetings.

A brown tabby crouches low on the wooden floor of a hallway, hissing with its mouth open, teeth showing and ears to the side; on the left a calm hallway with the front door

Why do cats hiss and growl at you?

A hiss or growl is a cat's warning to back off, used to avoid a fight and not to start one.

A hiss or a growl is a warning: your cat is saying "back off, I do not feel safe". Most often the reason is fear, but pain, a new animal, too much petting or a mother guarding her kittens can do it too. Step back, give your cat room and never punish it. Does the hissing start suddenly, or come when you touch one spot? Then ask the vet to check for pain.

Usually normal. Hissing and growling are normal cat warnings, and most cats do it at some point. Constant, sudden or out-of-character hissing is worth a vet check.

Why cats hiss and growl

1
A warning, not an attack
A hiss or growl tells another animal or a person to keep their distance. A cat would rather avoid a fight than have one, so it uses its voice to settle things before anyone gets hurt. The hiss often comes last, after quieter signals like turning ears, a flicking tail or moving away were missed. If the warning does not work and the cat cannot get away, a swat or a bite can follow.
2
How the sounds are made
A hiss is air pushed out through an open mouth over the tongue, with the teeth showing. It uses no voice at all. A spit is a shorter, harder burst, often just before or after a hiss. A growl is different: a low, rough, throaty sound made with the voice, often long. In a Swedish recording study a hiss lasted about half a second to a second, and spits were shorter.
3
Why a growl comes after the hiss
A growl is often added when body language and hissing do not seem to work, so it is the stronger warning. A puffed-up cat that hisses is mostly bluffing and scared. A calm, low, growling cat means it more. Growling mixed with high screams can mean a fight has started.
4
Like a snake? A theory, not proven
Many behaviourists think the hiss sounds like a snake and puts off enemies. In cats this has never been tested. The evidence comes from birds: tits in nest boxes hiss when something reaches into the nest, the sound is like a snake's, and in a test a nest raider stayed away from it. That says animals find a hiss frightening, not that a cat copies a snake.

The hiss, the growl and the rest of the body

Arched back, hair on end, standing side-on
A threat display: the cat makes itself look bigger and is ready to defend itself.
ScaredGive it some space
Crouched low, head tucked, turned sideways
A scared cat saying back off. It is not giving in, and it will defend itself if you keep coming.
ScaredGive it some space
Stiff and upright, hard stare, tail low
A confident threat rather than fear. The cat is ready to go after what it sees as an intruder.
AngryGive it some space
Ears flattened out to the sides
Fear: the cat wants to escape but will defend itself if cornered.
ScaredGive it some space
Ears turning sideways or back
An early warning, while you pet or approach, that it has had enough. Stop now, before a hiss or a bite.
AnnoyedTake it slowly
Tail puffed up like a bottle brush
A defensive display: the cat is frightened and tries to look bigger.
ScaredGive it some space
Tail wrapped close or tucked under
Fear: the cat is making itself small and would rather get away.
ScaredTake it slowly
Tail lashing from side to side
Irritated and close to the limit. A hiss, a swat or a bite can follow.
AnnoyedTake it slowly
Pupils wide open
Arousal: fear and anger both widen the pupils. On their own they do not tell you which, so read the posture too.
AlertTake it slowly
Fixed stare with narrow pupils
An offensive threat, more confident than fear. Do not stare back.
AngryGive it some space
Mouth open, lips back, teeth showing
The hiss face: the warning display that goes with the sound.
AnnoyedGive it some space
Whiskers flat to the face, or pushed forward
Fear: flat whiskers are tucked away, forward whiskers measure the distance to the threat.
ScaredTake it slowly

Long, breathy hiss with teeth showing
"Back off." Your cat feels threatened and wants distance: it is a warning, not an attack. It can also mean pain.
Hear it0:02
Recording: Zabuhailo, CC0, via Wikimedia Commons, shortened.
ScaredGive it some space
Short, sharp spit, sometimes with a swipe
A stronger, sudden warning, often just before or after a hiss. The cat is startled and frightened.
ScaredGive it some space
Low, rough, throaty growl
A firmer warning than the hiss: "I mean it, keep your distance." Added when the hiss did not work, and it can also come with pain.
AnnoyedGive it some space
Growling when you touch or lift it
It hurts there, especially if it turns its head toward the spot. Stop touching and have the vet check your cat.
UnsureTake it slowly
Long, loud yowl with growls at a cat
Probably a stronger threat to another cat that came too close. The same sound is used in distress and in the breeding season, so read the situation.
Hear it0:05
Recording: JMK, CC BY-SA 4.0, via Wikimedia Commons, shortened.
AngryGive it some space
Mother growls near her kittens, body stiff
"Keep away from my kittens." Protective and normal: leave her in peace.
AngryGive it some space
Hides, then hisses from its hiding place
The cat is trying to avoid the threat. Do not pull it out: let it come out in its own time.
ScaredTake it slowly

Why does my cat hiss at me? The reasons

Behaviour and surroundings

Fear
Most common
The most common reason. A cat that feels threatened and cannot get away hisses to make the threat back off. Common triggers are strangers, another cat in the house, a loud noise, someone coming at it unexpectedly or being handled. A cat that met few people as a kitten is more easily frightened. It tries to escape or hide first, and hisses, and later swats or bites, when it is cornered.
How to tell
- Crouched low, ears flat to the sides, wide pupils
- Tail tucked or puffed up
- Hisses from a hiding place or from a distance
Too much touch: petting, grooming or being picked up
Common
Many cats enjoy some petting and then reach a limit. Touch in a place your cat dislikes, going on too long, brushing or lifting can all bring a hiss or a growl. Your cat usually warns first: the tail flicks, the ears turn back, the skin twitches and the head turns toward your hand. A cat may hiss at one person and not another, because that person strokes, approaches or holds it differently.
How to tell
- Tail flicking or lashing, ears turning back
- Skin rippling over the back
- Turns its head toward your hand
A new cat, kitten or other animal
Very common
Bringing a new cat or dog home is one of the most common reasons for hissing. Many adult cats do not accept a strange adult cat at once. A resident cat may hiss, growl and swat at a kitten that keeps coming up to it, and the older the resident, the more likely. Hissing can also start when a young cat grows up, around one to two years, or when an unknown cat comes into the garden. Trouble between housemates often starts quietly, with staring or blocking the way to the litter box.
How to tell
- Hisses when the other animal comes into view
- Stares, blocks doors or the litter box
- The other cat makes itself small and moves away
A visitor or someone it does not know
A cat may hiss at a guest because it does not know them yet, not because the guest did anything wrong. It gets worse when visitors reach for the cat, chase it or lift it. A fearful cat hisses and growls from a hiding place or from a distance. A confident one may walk up to the guest, stop just out of reach, stare and flick its tail. Both mean stop.
How to tell
- Growls or hisses from under a bed or table
- Settles when left alone
The vet visit and the smell afterwards
Common
Most cats are tense at the vet, and many hiss, growl, swat or bite there. The smell of disinfectant and other animals, the strange room and being handled can be enough. After a visit many cats stay distant for a few days. A cat that comes home from the vet or a stay away smells unfamiliar, and housemates may hiss at it as if it were a stranger.
How to tell
- Hisses at the carrier or on the exam table
- Housemates hiss at the cat just back home
Upset by something it cannot reach
Common, with hissing at people
A cat that is worked up by something it cannot get to turns on whoever is nearby. The usual story is a cat seen through the window, a loud noise or a fight with another cat, and then a hiss or a swipe at a person or housemate who did nothing. The mood can last half an hour, hours or even days, and the attack can come hours after the trigger. That is why it seems to come from nowhere.
How to tell
- Was just staring out of the window, stiff and wide-eyed
- Sudden hiss at whoever is close
- Stays wound up for a long time
A mother protecting her kittens
A mother cat hisses and growls at anyone who comes close to her kittens, people and other animals included. It is protective and normal, strongest in the first week and fading as the kittens grow. A quiet, private corner and few visitors help. A mother may also hiss at her own kitten to stop it doing something.
How to tell
- Stays close to the nest
- Calms down when left alone
Play that went too far
Real play is quiet: cats playing together make short meows and chirps, not hisses or growls. A hiss in the middle of a game usually means one cat has had enough, is overexcited or scared, or has misread the other's play. Rough play is most common in young cats that grew up without littermates. End the game before the hiss, when the tail lashes, the ears go back and the pupils get bigger.
How to tell
- Tail lashing and ears going back during the game
- One cat runs off or turns on the other
A startle
A cat can hiss as a reflex when something surprises it, especially if it was distracted, is new to you, or has poor sight or hearing. The hiss comes out before it has thought, and is over in a moment.
How to tell
- Hisses when you appear suddenly
- Calm again within seconds
Stress and change at home
Moving house, a guest, a baby, a new pet, moved furniture or a change in routine can make a cat hiss for a few days. Regular hissing is a sign the cat is under a lot of stress, so look for the source.
How to tell
- Started after a change
- Hiding more
Guarding food, a favourite spot or the litter box
Cats growl over food, or hiss when another cat comes near the bowl, a favourite resting place or the litter box. This is most common in homes with several cats, and when there are too few resources or they are badly placed.
How to tell
- Growls while eating
- Sits at the litter box or blocks a path

Physical causes

Pain or illness
A cat in pain may hiss or growl to stop you touching the sore spot, even if it is normally loving. The reaction can be much stronger than the touch seems to deserve. Arthritis, dental disease, an abscess, an ear infection, an overactive thyroid and injuries are all named. In a hospital study, growling and hissing helped tell cats in pain from pain-free cats. Cats hide pain well, so a hiss may be the first thing you notice.
How to tell
- Hisses when one spot is touched or when lifted
- Starts suddenly and is out of character
- Eats less, hides more, stops jumping

Hissing at you, at a new cat or at the vet

Your cat hisses at you: A friendly cat that hisses at you is usually scared, in pain or stressed, and is asking to be left alone for a while. It does not mean your cat hates you. Look at what you were doing: reaching, touching, lifting, blocking its way or coming at it while it was already tense.
Hissing at one person only: A cat can hiss at one person and not at others, because that person approaches, handles or blocks it differently, smells unfamiliar or moves fast. Ask that person to ignore the cat and let it come to them.
Your cat hisses when picked up: Being lifted or held can scare a cat, or hurt it if its joints are sore. Is a hiss or growl at lifting new? Then have the vet check for pain.
Hissing at a new cat or kitten: Hissing during an introduction is normal and means the cats need more distance or a slower pace, not forced contact. An older resident cat is more likely to hiss, growl and swat at a kitten that keeps approaching.
Your cats suddenly stop getting along: Cats that lived together peacefully can start hissing after one was at the vet, after a scare at the window, when one grows up or when there are too few resources. Separate them calmly for a while, then introduce them again step by step as if they were new, and have both checked by the vet.
Your cat hisses at a dog: A cat facing a dog usually freezes and watches, and hisses or growls if the dog comes too close. Make sure the cat has a high place or a room the dog cannot reach.
Your cat hisses at the vet: Hissing, growling and swatting at the vet is very common, because of the strange room and smells, handling and earlier visits. Is your cat very fearful? Then ask the vet about calming medicine before visits.

What to do when your cat hisses or growls

1
Stop what you are doing, step back and give your cat room.
A hiss asks for distance. Backing away is the quickest way to end it, and it keeps you from a scratch or a bite.
2
Stay calm: do not stare, loom over it or corner it, and leave a way out.
Staring and crowding feel like a threat to a scared cat, and a cat with no escape may scratch or bite. Standing side-on and a slow blink can signal calm.
3
Do not pet, pick up or comfort a hissing cat. Wait until it has fully calmed down.
Touch makes it feel more threatened, and a worked-up cat can stay tense for half an hour, hours or even days. Reward calm, friendly behaviour with a game or a treat afterwards.
4
Give your cat hiding places and a quiet room, and do not pull it out of hiding.
A cat that can retreat feels safer, which cuts hissing. Let it come out in its own time, and ask others in the home to leave it alone too.
5
Find the trigger and take it away: note what happened just before, your cat's body language and what it did after. Close a blind on a cat outside, for example, or ask visitors to ignore your cat.
That shows whether it is fear, pain, a rival cat or too much handling, and a short video helps the vet. If the trigger cannot be avoided, slow getting used to it from a distance, with treats, helps.
6
Introduce a new cat slowly: its own room with its own litter box, food and water first, then swap scents with a towel, feed on either side of a door, then let them see each other, and only then meet. A cat back from the vet can spend a little time in its own room first too.
Rushing makes the hissing worse. It can take weeks to months, and older cats may need longer. If they hiss, go back a step.
7
Give each cat its own litter box, food, water, bed and perch: one per cat plus one extra, spread through the home.
Conflict rises when resources are scarce or badly placed. This way cats are not forced to share.

Better not

Do not punish your cat for hissing or growling: no shouting, water spray or hitting, and do not hiss back.It does not stop the behaviour, it teaches your cat to fear you and it removes the warning, so next time it may bite without hissing. In a Canadian survey of 260 cats, scolding and scruffing went with more aggression toward owners.
Do not stare at it, corner it, pick it up or hold it.Eye contact, approaching and being held feel threatening. A cat that cannot escape may attack.
Do not put a hand between fighting cats or pull them apart.Such bites are not held back and can be serious. A loud noise or throwing something soft can stop a fight without touching the cats. Then keep them apart for hours or days.
Do not rush a new cat, or put cats back together too soon after a fight.Fast introductions and early reunions bring the hissing back.
Do not keep touching a sore spot to test the reaction.It hurts, and it is not safe for your cat or for you. Let the vet find the cause.

When to see a vet?

Most hissing is a fear warning that needs space, not a vet. A sudden change, or hissing when you touch one spot, can be pain and should be checked first, before any behaviour training.

See a vet if

Hissing or growling with trouble breathing, collapse or a seizure: emergency vet now.
A male cat straining in the litter box with little or no urine, growling before using the box or with blood in the urine: the same day.
Hissing that starts suddenly with no clear trigger, or a touch that used to be fine now brings a hiss or growl.
Hissing or growling when one body part is touched, or when your cat is lifted.
Hissing together with eating less, hiding more, grooming less, lethargy, limping or not wanting to jump.
Hissing when no person or animal is around.
A cat over 6 to 7 years that suddenly starts hissing or attacking (a thyroid check is advised).
Hissing that gets worse, hurts people or animals, or makes routine care unsafe.

What research says

Six threat sounds recorded in one household
After a new cat joined three resident cats, a Swedish researcher recorded 468 threat sounds from four cats and sorted them into six types: growl, howl, howl-growl, hiss, spit and snarl. One cat made 78 per cent of them, and the cats calmed down after about two weeks while they could retreat to a safe place. It was one household, so the results are tentative.
Susanne Schötz, Lund University, 2015
Four in ten cats growl, hiss, swat or bite at the vet
In a US owner survey of 759 cats, 42.6 per cent were reported to growl, hiss, swat or bite at the vet clinic. Those cats were also more likely to be aggressive to strangers, their owners and other animals at home. The survey shows a link, not a cause.
Gerken and colleagues, US owner survey, 2024
Hissing helps tell cats in pain from pain-free cats
Experts drew up a list of pain behaviours in cats. In a hospital study of that list, growling and hissing helped separate cats in pain from cats that were not.
Marangoni, Beatty and colleagues, 2023
A cat in view is the most common trigger for a redirected attack
Of 27 cats that were aggressive toward people, 14 turned out to be redirecting anger at something they could not reach. The most common trigger was another cat in view. No medical problem was found in these cats. It was a small case series.
Chapman and Voith, 1990
Snake-like hisses keep nest raiders away, in birds
Tits in nest holes make a hiss that sounds like a snake's. They hiss more where snakes are common, nests were raided less where hissing was more common, and striped squirrels avoided the sound. This is a bird study: nobody has tested whether a cat's hiss copies a snake.
Møller and colleagues, 2021

Story or true?

A hissing cat wants to attack.
A hiss is a defensive warning: the cat would rather avoid a fight. Only if it has no way out and the warning does not work may it scratch or bite.
A cat hisses to be naughty, jealous or in a bad mood.
It is a warning from fear, pain, stress, frustration or conflict, not a character flaw.
Cats hiss to show who is boss and settle a pecking order.
Cats do not form a fixed ranking. A hiss between housemates sets limits and defends space, resources and routes. A cat that makes itself small is not giving in either.
Hissing copies a snake to scare enemies.
Some behaviourists think so, but in cats it is only a theory. The only evidence comes from nesting birds.
If you punish hissing, it will stop.
Punishment makes the cat more afraid and removes the warning, so it may bite without hissing first.

Did you know?

42.6%
In a US owner survey, 42.6 per cent of cats growled, hissed, swatted or bit at the vet clinic.
Six sounds
Researchers sorted one household's threat sounds into six types: growl, howl, howl-growl, hiss, spit and snarl.
About a second
In a Swedish recording study a hiss lasted 0.4 to 1 second, and a spit 0.3 to 0.7 seconds.
Hours later
A cat upset by something outside can lash out at you hours later, so it seems to come from nowhere.

Kittens and older cats

Kitten
Kittens as young as two to three weeks can hiss and spit when picked up for the first time. Kittens learn trust from about two to nine weeks, and a kitten that met few people then may hiss out of fear.
Kitten
A kitten that keeps pestering an older resident cat may get frequent hissing, growling and swats. The older cat is defending its space, and adult newcomers are accepted less easily than kittens. A mother may also hiss at her own kitten to stop unwanted behaviour.
Older cat
A cat over 6 to 7 years that suddenly starts to hiss or attack should be checked first, thyroid included. Older cats adjust more slowly, so go slowly with changes and introductions.

Frequently asked questions

Why does my cat suddenly start hissing?
Often something has scared or stressed it: a noise, a cat outside, a visitor or a change at home. But sudden hissing, or hissing when you touch one spot, can mean pain. Have the vet check it if it lasts, or if your cat also hides or eats less.
Does my cat hate me when it hisses at me?
No. A hiss says the moment is too much: your cat is scared, hurting or has had enough. It says nothing about whether it likes you. Give it room and it will often come back by itself.
Why does my cat hiss or growl when I pet it?
It has reached its limit, or the touch hurts or is in a place it dislikes. Watch for a flicking tail and ears turning back, stop at the first sign and keep petting short. If it hisses at one spot every time, ask the vet to check for pain. If it also bites while you pet it, read more there.
What is the difference between a hiss and a growl?
A hiss is a breathy sound with no voice, made through an open mouth, and mostly comes from fear. A growl is a low, rough sound made with the voice, a firmer warning that comes when the hiss did not work. Take both seriously and give space.
Why does my cat hiss when playing?
Real play is quiet, so a hiss means the game got too rough or too exciting, or one cat misread the other. End the game before that point, and use a wand toy instead of your hands.
Why does my cat huff at me?
A short huff or puff has not been studied well. Blowing and snorting sounds are mentioned with a defensive posture, and a blowing hiss belongs to a scared cat that does not want to be approached. So treat it like a quiet hiss: step back and look at the rest of your cat.
What can I do if my cats cannot get along any more and keep hissing?
Separate them calmly, give each its own litter box, food and resting places, and have both checked by the vet. Then introduce them again step by step, as if they were strangers: scents first, then sight through a barrier, then short meetings.

Why do cats hiss and growl at you?

Why cats hiss and growl

A warning, not an attack

How the sounds are made

Why a growl comes after the hiss

Like a snake? A theory, not proven

The hiss, the growl and the rest of the body

Arched back, hair on end, standing side-on

Crouched low, head tucked, turned sideways

Stiff and upright, hard stare, tail low

Ears flattened out to the sides

Ears turning sideways or back

Tail puffed up like a bottle brush

Tail wrapped close or tucked under

Tail lashing from side to side

Pupils wide open

Fixed stare with narrow pupils

Mouth open, lips back, teeth showing

Whiskers flat to the face, or pushed forward

Long, breathy hiss with teeth showing

Short, sharp spit, sometimes with a swipe

Low, rough, throaty growl

Growling when you touch or lift it

Long, loud yowl with growls at a cat

Mother growls near her kittens, body stiff

Hides, then hisses from its hiding place

Why does my cat hiss at me? The reasons

Behaviour and surroundings

Fear

Too much touch: petting, grooming or being picked up

A new cat, kitten or other animal

A visitor or someone it does not know

The vet visit and the smell afterwards

Upset by something it cannot reach

A mother protecting her kittens

Play that went too far

A startle

Stress and change at home

Guarding food, a favourite spot or the litter box

Physical causes

Pain or illness

Hissing at you, at a new cat or at the vet

What to do when your cat hisses or growls

Stop what you are doing, step back and give your cat room.

Stay calm: do not stare, loom over it or corner it, and leave a way out.

Do not pet, pick up or comfort a hissing cat. Wait until it has fully calmed down.

Give your cat hiding places and a quiet room, and do not pull it out of hiding.

Find the trigger and take it away: note what happened just before, your cat's body language and what it did after. Close a blind on a cat outside, for example, or ask visitors to ignore your cat.

Introduce a new cat slowly: its own room with its own litter box, food and water first, then swap scents with a towel, feed on either side of a door, then let them see each other, and only then meet. A cat back from the vet can spend a little time in its own room first too.

Give each cat its own litter box, food, water, bed and perch: one per cat plus one extra, spread through the home.

Better not

When to see a vet?

What research says

Six threat sounds recorded in one household

Four in ten cats growl, hiss, swat or bite at the vet

Hissing helps tell cats in pain from pain-free cats

A cat in view is the most common trigger for a redirected attack

Snake-like hisses keep nest raiders away, in birds

Story or true?

Did you know?

Kittens and older cats

Read next

Frequently asked questions

A cat at home?